# Core-firmware setup **URL:** \ **Category:** Firmware\ **Created:** [January 29, 2014, 6:40am UTC](https://community.particle.io/t/core-firmware-setup/2449 "2014-01-29T06:40:40Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![theicfire](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/theicfire/32/20771_2.png) [@theicfire](https://community.particle.io/u/theicfire)\ **Post date:** [January 29, 2014, 6:40am UTC](https://community.particle.io/t/core-firmware-setup/2449/1 "2014-01-29T06:40:41Z")
I got through all the steps mentioned in: > **[particle-iot/device-os](https://github.com/particle-iot/device-os)** > > Device OS (Firmware) for Particle Devices. Contribute to particle-iot/device-os development by creating an account on GitHub. Until the very end. I found that “sudo dfu-util -l” was needed to get the same output as the README mentions. But then when I run “sudo dfu-util -d 1d50:607f -a 0 -s 0x08005000:leave -D core-firmware.bin”, I get the response: “invalid dfuse address: 0x08005000:leave” Any thoughts on what I’m missing? My spark core is currently flashing yellow, as mentioned. Thanks!! ---
**Author:** ![theicfire](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/theicfire/32/20771_2.png) [@theicfire](https://community.particle.io/u/theicfire)\ **Post date:** [January 29, 2014, 6:42am UTC](https://community.particle.io/t/core-firmware-setup/2449/2 "2014-01-29T06:42:26Z")
Ah, updating dfu-util was the answer: > **[Error: Invalid dfuse address: 0x08005000:leave \[SOLVED\]](https://community.particle.io/t/error-invalid-dfuse-address-0x08005000-leave-solved/2426)** > > I ran make all went well. Now i am trying to flash the Spark Core. acording to the readme file it says to do: dfu-util -d 1d50:607f -a 0 -s 0x08005000:leave -D core-firmware.bin yet, i get the following error. Error: Invalid dfuse address:... I got to .7 by building the source mentioned here: [http://dfu-util.gnumonks.org/build.html](http://dfu-util.gnumonks.org/build.html)